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<p><a name=x66>:</a><b>x66</b> (<i>c</i>/2 orthogonally, p4) Found by Hartmut Holzwart, July 1992.
Half of this can be escorted by a HWSS. The name refers to the
fact that every cell (live or dead) has at most 6 live neighbours
(in contrast to <a href="lex_s.htm#spaceship">spaceships</a> based on <a href="lex_l.htm#lwss">LWSS</a>, <a href="lex_m.htm#mwss">MWSS</a> or <a href="lex_h.htm#hwss">HWSS</a>).
In fact this spaceship was found by a search with this restriction.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
..O......
OO.......
O..OOO..O
O....OOO.
.OOO..OO.
.........
.OOO..OO.
O....OOO.
O..OOO..O
OO.......
..O......
</a></pre></td></tr></table></center>
<p><a name=xlife>:</a><b>Xlife</b> A popular freeware Life program that runs under the X Window
System. The main Life code was written by Jon Bennett, and the X
code by Chuck Silvers.
<p><a name=xpentomino>:</a><b>X-pentomino</b> Conway's name for the following <a href="lex_p.htm#pentomino">pentomino</a>, a
<a href="lex_t.htm#trafficlight">traffic light</a> <a href="lex_p.htm#predecessor">predecessor</a>.
<center><table cellspacing=0 cellpadding=0><tr><td><pre><a href="lexpatt:">
.O.
OOO
.O.
</a></pre></td></tr></table></center>
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